碳酸钡在高温及高压下的相变行为

doi:10.11896/cldb.18110124

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Abstract Aiming at exploring the phase transition behavior of BaCO₃ under high temperature and high pressure, the differential scanning calorimeter (DSC) was employed to characterize the process of phase transition of BaCO₃ from room temperature to 1 200 ℃, and Raman spectrometer was adopted to analyze the phase transition features of BaCO₃ from atmospheric pressure to 15.2 GPa. According to the DSC analysis results, there were two endothermic peaks of BaCO₃ at 808 ℃ and 955 ℃, which corresponded to the transitions of orthorhombic phase to trigonal phase and trigonal phase to cubic phase, respectively. When the pressure rose from atmospheric pressure to 10.6 GPa, the frequency shift of all Raman modes of BaCO₃ increased monotonically, and no phase transition of BaCO₃ was found under the pressure below 10.6 GPa. The phase transition of BaCO₃ from orthorhombic (Pmcn) to trigonal (P31c) structure occurred around 10.6 GPa, and no further change in BaCO₃ phases could be recognized in the spectra when the pressure exceeded 10.6 GPa. From the Raman spectra of pressure released BaCO₃, v₁ symmetric stretching band of the [CO₃] did not retrogress from high pressure phase (trigonal structure) of BaCO₃ to ambient phase (orthorhombic structure).

Key words： BaCO₃ high pressure high temperature Raman spectroscopy differential scanning calorimetry phase transition

Published: 28 October 2019

CLC number:

P313.3

Fund:This work is financially supported by the Xinjiang University Doctoral Start-up Funding (61341), Thousand Talents Program, Partially Supported by Scientific Research Starting Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China (60594).

About author:: Mubarak Molutjan received her B.S. degree in phy-sics from Xinjiang University in 2015. She is currently pursuing her Master’s degree at Xinjiang University under the supervision of associate Dr. Anwar Hushur. Her research has focused on high pressure physics;Anwar Hushurreceived his B.S. degree in physics from Xinjiang University in 1995, and received his M.S and Ph.D. degrees in University of Tsukuba in 2006. From 2006 to 2011, worked at the school of Geo-physics and astrology in University of Hawaii at Manoa. He is currently a teacher in Xinjiang University. In 2012, he was selected as high-level talent program in Xinjiang Autonomous Region of China. In 2013, he was selected as overseas high-level talent “Thousand talent program” Xinjiang project. His research interests are preparation of new materials at high temperature and high pressure, and the use of X-ray diffraction and light scattering technology to study the Earth’s material and material properties. 33 relevant papers have been published in SCI International authoritative journals of Journal of Physics, Journal of Solid State Chemistry, American Mineralogist, Journal of Applied Physics, Physical Review B, cited 347 times, H index 11. 13 participation in international academic conferences and report of the meeting.

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Cite this article:

Mubarak Molutjan,Anwar Hushur,WANG Jing, et al. Phase Transition of BaCO₃ Under High Temperature and High Pressure[J]. Materials Reports, 2019, 33(24): 4062-4065.

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http://www.mater-rep.com/EN/10.11896/cldb.18110124 OR http://www.mater-rep.com/EN/Y2019/V33/I24/4062

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